Positronic robot books, for children–not by the Asimovs–not Norby-circa late 69-early 70s.
The robot in the series had colored gem-like buttons on its head, for shooting different rays.
What were they called?
Not so much as a bump? PEOPLE…! :dubious: :rolleyes:
I know that somebody on the SDMB keeps track of kid’s SF.